On my car the lens itself unscrews 2002 Plus8. No screws just unscrew the whole lens by hand. It might be tight so persevere carefully. A bit like taking a tight lid off a jar.
My 2008 Plus 4 4-seater has the same lamps. The lamp glass unscrews like a lid of a marmelade jar.There is no access from behind the spare wheel.
Harald
